[mkl]

I don't think that's possible. Much of the popular media in the English-speaking world is in a standard-ish General American accent, and yet still the diversity in accents is enormous.

The only way I can think of to do it is if all phones and computers had really good voice control systems that nonetheless only understood the standard pronunciation (like early versions of Dragon dictation). The voice system makers have a vested interest in not doing that, but in understanding everyone as they talk. Arabic has tried for centuries, with the full force of a major religion, and yet still the language is splintered into mutually unintelligible dialects.

People talk how they talk, and it's constantly changing. I don't think anyone can control that.